Improvement in casting hollow-metal rollers with shafts



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Letters Patent No. 93,257, dated August 3, 1869.

nvrPRovfrui/rrnvrl IN cAsTING' HoLLow-METAL RoLLERs WITH SHAFTS.

The Schedie'referred to in these Letters Patent and making part of thesame.

To all persons to whom these presents may come:

Be it known that I, ZADocK WAsHBURN, of Hopedale, in the county ofWorcester, and State of Massachusetts, have made a new and usefulinvention, having reference to the Manufacture of Hollow Gast- MetalRollers with Shafts; and .I do hereby declare the same to be fullydescribed in the following specilication, and represented in theaccompanying drawings, of which- Figure 1 denotes a side view;

Figure 2, a longitudinal. section; and

Figure 3, an end view of a roller and its shaft, made in accordance withmy invention.

Figure 4 is a transverse section, taken through one head of the roller,so as to show the cavities made in the shaft, for the purpose of holdingit tothe head, and preventing it from revolving therein.

Figure 5 is a top view of the shaft, showing such cavities.

The objectI have had inview, in making my invention, has been to make' ahollowr cylinder, to be cast upon a shaft, without danger of breakage ofthe cylinder by the lengthwise' contraction of it, which takes placeduring the process of the cooling of the cylinder, after it may have'been cast upon the shaft.

For this purpose I form the shaft in two or. more parts, and provide oneof them with a socket, to receive a projection from the other, and Iarrange such parts in line with one another, and in the axis of themould, and so that both may support the core, for forming the chamber orhollow space of the cylinder. In the drawings- A denotes the hollowcylinder, having two heads, a a, and a cylindrical chamber or space, b,extending from one to the other of such heads, and` arrangedconcentrically with the outer curved surface of the cylinder.

The core of the mould for casting such a cylinder is to be cylindricalin form, and to be made on the two parts B C of the axle, or with themgoing through it lengthwise and concentrically with it.

Besides such, there should be one or more Smaller cores arranged in themould, and properly supported, so as to form either or each of the headsof the cylinder, with one or moreI holes, d, going through it, suchholes being to enable a person to remove from th'e cylinder, after itmay haveA been cast, the material constituting the core or cores.

lhe major part, B, oi` the shaft is made with a socket, e, extendinginto one end of it, and to receive a tenon, f, projeoted'from the nextadjacent end of the minor part C.A

Furthermore, in each of the parts B C, where the cylinder-head is to becast upon it, there is to be one or more cavities, g, or insteadthereof, there may be one or more projections or nipples, extending fromthe shaft.

The mould is to be formed with cavities, to receive and support thoseparts of the lshaft which are to cxtend beyond the heads of thecylinder.

WVhen the shaft is so made, it will be seen that thecylinder, afterhaving been cast upon it, and upon the core previously l placed ormoulded on the shalt, will be able to contract lengthwise, whilecooling, without danger of either' of its heads being broken or forcedoff the bodyof the cylinder by the shaft, for the part of the shaftattached to'one head of the cylinder will be free to slide or moveendwise, without interruption from the other part, and consequently thecylinder, while cooling, will be free to contract.

I make no claim to a hollow cylinder with a single shaftextending-.through it from end to end, and beyond the ends Vof suolicylinder; nor do I claim a hollowcylinder as made with journals, toproject from its opposite ends only.

What I claim as my invention, and as an improvement in casting ashaftand hollow cylinder or roller together, and the. latter upon a core, isv The employment of the shaft in the two parts'B C, socketed andtenoned, and arranged in the core and mould as described, the wholebeing as and for the purpose specified.

Also, the shaft as made in two or more parts, socketed and tenonedtogether as described, and provided with cavities, for the metal of theheads to flow into, when castupon the shaft, as described.

Also, the new or improved manufacture of metallic roller, as made withits shaft constructed in two or more parts, sockcted and tenoned, andarranged as described, and with the metal of the heads cast intocavities ofthe shaft, or upon projections from such shaft, the wholebeing as explained.

' ZADOOK WASHBURN.

Witnesses;

F. J DUTCHER, E. D. BANcnoFT.

